CN112652273A - LED backlight driving circuit, driving device and driving method - Google Patents
LED backlight driving circuit, driving device and driving method Download PDFInfo
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- CN112652273A CN112652273A CN201910964144.1A CN201910964144A CN112652273A CN 112652273 A CN112652273 A CN 112652273A CN 201910964144 A CN201910964144 A CN 201910964144A CN 112652273 A CN112652273 A CN 112652273A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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Abstract
The invention discloses an LED backlight driving circuit, a driving device and a driving method, wherein the LED backlight driving circuit is connected with a backlight lamp panel and comprises a driving module and a switch module, the switch module is connected with the driving module, and the driving module is also connected with a light emitting module on the backlight lamp panel; the switch module is used for receiving row driving signals and column driving signals, outputting the row driving signals to the driving module after the row driving signals and the column driving signals are conducted, and controlling the light-emitting module to be lightened by the driving module according to the row driving signals.
Description
Technical Field
The invention relates to the technical field of LED driving, in particular to an LED backlight driving circuit, a driving device and a driving method.
Background
The Local dimming technique (Local dimming) is a novel liquid crystal panel backlight driving technique, divides a backlight into different areas, and controls brightness of corresponding area lamps through backlight driving when different pictures are played, so that viewing experience of a display panel is improved. With the development of the technology, the number of backlight partitions starts to increase gradually, and the backlight partitions need to be made smaller, and more driving circuits are needed to complete backlight driving.
At present, the area backlight technology mainly divides the panel backlight into corresponding areas, and an external driving circuit board is adopted to correspondingly control each area. And more external driving circuits are needed for R/G/B Local dimming. The increase of the number of the partitions is difficult to realize after a certain number of the partitions, and the cost is high.
Thus, the prior art has yet to be improved and enhanced.
Disclosure of Invention
In view of the above disadvantages of the prior art, an object of the present invention is to provide an LED backlight driving circuit, a driving device and a driving method, so as to optimize the structure of the driving circuit and improve the utilization rate of the LED backlight area in the backlight panel.
In order to achieve the purpose, the invention adopts the following technical scheme:
an LED backlight driving circuit is connected with a backlight lamp panel and comprises a driving module and a switch module, wherein the switch module is connected with the driving module, and the driving module is also connected with a light emitting module on the backlight lamp panel; the switch module is used for receiving row driving signals and column driving signals, outputting the row driving signals to the driving module after the row driving signals are conducted according to the column driving signals, and controlling the light-emitting module to be lightened by the driving module according to the row driving signals.
The LED backlight driving circuit also comprises an energy storage module, and the energy storage module is connected with the switch module and the driving module; the energy storage module is used for storing electric energy after the switch module is switched on, and further maintaining the lighting state of the light emitting module.
In the LED backlight driving circuit, the switch module comprises a first switch tube, a control end of the first switch tube is connected with a column driving signal input end, a first connection end of the first switch tube is connected with a row driving signal input end, and a second connection end of the first switch tube is connected with the energy storage module and the driving module.
In the LED backlight driving circuit, the energy storage module comprises a capacitor, one end of the capacitor is connected with the second connecting end of the first switching tube and the driving module, and the other end of the capacitor is grounded.
In the LED backlight driving circuit, the driving module includes a second switching tube, a control end of the second switching tube is connected to one end of the capacitor and a second connection end of the first switching tube, a first connection end of the second switching tube is connected to the light emitting module, and a second connection end of the second switching tube is grounded.
In the LED backlight driving circuit, the driving module includes a third switching tube, a control end of the third switching tube is connected to one end of the capacitor and the second connection end of the first switching tube, the first connection end of the third switching tube is connected to power, and the light emitting module of the third switching tube is connected to the light emitting module.
The LED backlight driving device comprises a PCB, wherein the PCB is provided with a plurality of LED backlight driving circuits.
An LED backlight driving method comprises the following steps:
the switching module receives a row driving signal and a column driving signal, and outputs the row driving signal to the driving module after the row driving signal and the column driving signal are conducted according to the column driving signal;
and controlling the light-emitting module to light up by the driving module according to the row driving signal.
In the LED backlight driving method, the row driving signal includes a first driving signal, a second driving signal and a third driving signal, and the first driving signal, the second driving signal and the third driving signal are input in a time-sharing manner.
In the LED backlight driving method, the step of controlling the lighting of the light emitting module by the driving module according to the row driving signal includes:
the first gating switch is turned on, and the driving module controls the first light emitting diode to light according to the first driving signal;
the second gating switch is turned on, and the driving module controls a second light emitting diode to light according to the second driving signal;
and the third gating switch is turned on, and the driving module controls the third light-emitting diode to light according to the third driving signal.
Compared with the prior art, the LED backlight driving circuit, the driving device and the driving method provided by the invention have the advantages that the LED backlight driving circuit is connected with the backlight lamp panel and comprises a driving module and a switch module, the switch module is connected with the driving module, and the driving module is also connected with a light emitting module on the backlight lamp panel; the switch module is used for receiving row driving signals and column driving signals and outputting the row driving signals to the driving module after the column driving signals are conducted, and the driving module controls the light-emitting module to be lightened according to the row driving signals.
Drawings
Fig. 1 is a block diagram of an LED backlight driving circuit provided in the present invention;
FIG. 2 is a schematic circuit diagram of a first preferred embodiment of an LED backlight driving circuit according to the present invention;
FIG. 3 is a timing diagram of row driving signals in the LED backlight driving circuit according to the present invention;
FIG. 4 is a schematic circuit diagram of a second preferred embodiment of the LED backlight driving circuit according to the present invention;
FIG. 5 is a flowchart of a method for driving an LED backlight according to the present invention;
fig. 6 is a flowchart of step S200 in the LED backlight driving method provided in the present invention.
Detailed Description
The invention provides an LED backlight driving circuit, a driving device and a driving method, which can effectively improve the utilization rate of an LED backlight lamp area in a backlight lamp panel and optimize the structure of the driving circuit.
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 and fig. 2, the LED backlight driving device provided by the present invention is connected to a backlight lamp panel 20, and is configured to drive each LED backlight area in the backlight lamp panel 20 to emit light, where the LED backlight driving device includes a plurality of independent LED backlight driving circuits 10, and each LED backlight driving circuit 10 correspondingly drives one LED backlight area to emit light. The LED backlight driving circuit 10 includes a driving module 100 and a switch module 200, the switch module 200 is connected to the driving module 100, the driving module 100 is further connected to a light emitting module 210 on the backlight lamp panel 20, and the light emitting module 210 corresponds to an LED backlight area of the backlight lamp panel 20.
Referring to fig. 2, after the LED backlight driving device enters a working state, the switch module 200 in the LED backlight driving circuit 10 is configured to receive a row driving signal Vs and a column driving signal Vg, and output the row driving signal Vs to the driving module 100 after being turned on according to the column driving signal Vg, and the driving module 100 controls the light emitting module 210 to light according to the row driving signal Vs; preferably, the LED backlight driving circuits 10 are arranged in a square matrix, and the column driving signals are scanned in columns in the whole array, and preferably, the column driving signal Vg is a high level signal, when a first high level signal comes temporarily, a first row in the array of the LED backlight driving circuits 10 is opened, that is, each LED backlight driving circuit 10 in the first row simultaneously receives the row driving signal Vs and starts to operate, when a second high level signal comes temporarily, each LED backlight driving circuit 10 in a second row simultaneously receives the row driving signal Vs and starts to operate, and so on, the driving of each LED backlight area is completed; the switch module 200 is turned on after receiving the column driving signal Vg, and then the row driving signal Vs is output to the driving module 100 through the switch module 200, so that the driving module 100 drives the light emitting module 210 to light according to the row driving signal Vs, thereby implementing control of lighting and extinguishing of each LED backlight area in the backlight panel 20.
Further, please continue to refer to fig. 1, the LED backlight driving circuit 10 further includes an energy storage module 300, wherein the energy storage module 300 is connected to the switch module 200 and the driving module 100; the energy storage module 300 is configured to store electric energy after the switch module 200 is turned on, so as to maintain the lighting state of the light emitting module 210; specifically, after the switch module 200 is turned on, the energy storage module 300 enters a charging state according to the row driving signal Vs to store electric energy, and when no row driving signal Vs is input, the energy storage module 300 outputs electric energy to provide working electric energy for the driving module 100, so that the driving module 100 continuously drives the light emitting module 210 to light up until a next row driving signal Vs comes, thereby effectively improving the light emitting time of the light emitting module 210.
Further, with continued reference to fig. 2, the switch module 200 includes a first switch tube T1, the control end of the first switch tube T1 is connected with the input end of a column driving signal Vg, the first connection end of the first switch tube T1 is connected with the input end of a row driving signal Vs, a second connection terminal of the first switching tube T1 is connected to the energy storage module 300 and the driving module 100, when the column driving signal Vg comes on, it is output through the control terminal of the first switch transistor T1, the first switch transistor T1 is turned on, and then the row driving signal Vs is inputted through the first control terminal of the first switch transistor T1 and outputted to the driving module 100 through the first switch transistor T1, the driving module 100 controls the on/off of the LED light emitting module 210 according to the row driving signal Vs, and preferably, the first switch tube T1 is a thin film transistor.
Further, the energy storage module 300 includes a capacitor C1, one end of the capacitor C1 is connected to the second connection terminal of the first switch tube T1 and the driving module 100, and the other end of the capacitor C1 is grounded, after the first switch tube T1 is turned on, the capacitor C1 enters a charging state according to the row driving signal Vs, stores electric energy, and when no row driving signal Vs is input, the capacitor C1 discharges to provide a working voltage for the driving module 100, so that the driving module 100 continuously drives the light emitting module 210 to light up until a next row driving signal Vs comes, and the voltage is maintained through charging and discharging of the capacitor C1, which can effectively improve the light emitting time of the light emitting module 210.
Further, in the first preferred embodiment of the present invention, referring to fig. 3, the driving module 100 includes a second switch tube T2, the control end of the second switch tube T2 is connected with one end of the capacitor C1 and the second connection end of the first switch tube T1, a first connection terminal of the second switch transistor T2 is connected to the light emitting module 210, a second connection terminal of the second switch transistor T2 is grounded, preferably, the row driving signal Vs is a working voltage signal for controlling the second switch transistor T2, when the row driving signal Vs arrives, the second switch transistor T2 is turned on, forming a path to ground with the light emitting module 210, the light emitting module 210 emits light, and the capacitor C1 is charged at the same time, so as to provide an operating voltage to the second switch tube T2 when there is no row driving signal Vs, so as to maintain the operating state of the second switch tube T2.
Further, in this embodiment, the light emitting module 210 includes a first gating switching tube M1, a second gating switching tube M2, a third gating switching tube M3, a first light emitting diode L1, a second light emitting diode L2 and a third light emitting diode L3, a first connection end of the first gating switching tube M1 is connected to electricity, the other end of the first gating switching tube M1 is connected to an anode of the first light emitting diode L1, a cathode of the first light emitting diode L1 is connected to one end of the second switching tube T2, a first connection end of the second gating switching tube M2 is connected to electricity, the other end of the second gating switching tube M2 is connected to an anode of the second light emitting diode L2, and a cathode of the second light emitting diode L2 is connected to one end of the second gating switching tube M2; the first connection end of the third gating switching tube M3 is connected with electricity, the other end of the third gating switching tube M3 is connected with the anode of the third light emitting diode L3, and the cathode of the third light emitting diode L3 is connected with one end of the third gating switching tube M3.
In this embodiment, the first light emitting diode L1, the second light emitting diode L2, and the third light emitting diode L3 are connected in parallel and respectively correspond to a red LED lamp, a green LED lamp, and a blue LED lamp; correspondingly, the row driving signal Vs includes a first driving signal for driving the first light emitting diode L1, a second driving signal for driving the second light emitting diode L2, and a third driving signal for driving the third light emitting diode L3, and the first driving signal, the second driving signal, and the third driving signal are input in a time-sharing manner, specifically, the first switching tube T1 is turned on when receiving a high level signal, and then the first driving signal is output to the second switching tube T2 through the first switching tube T1 to provide an operating voltage for the second switching tube T2, at the same time, the first gating switching tube M1 is turned on, the first light emitting diode L1 is connected into a circuit, and since the first gating switching tube M1 is also connected with power, at this time, the first gating switching tube M1 is turned on, the second switching tube T2 is turned on, the first light emitting diode L1 is connected to ground to have a current passing through to start lighting, after the first light emitting diode L1 starts to light, the first gating switch tube M1 is opened; then the second gate switch tube M2 is turned on, and at the same time, a second driving signal is output to the second switch tube T2 through the first switch tube T1, the second switch tube T2 is turned on, the second light emitting diode L2 starts to light up, and then the second gate switch tube M2 is turned on; then the third gate switch tube M3 is turned on, and simultaneously, a third driving signal is output to the second switch tube T2 through the first switch tube T1, the second switch tube T2 is turned on, then the third light emitting diode L3 starts to light, the third gate switch tube M3 is turned on, thereby realizing time-sharing driving of three-color lamps, and three LED lamps can be simultaneously driven through one LED backlight driving circuit 10, avoiding matching each LED lamp with an independent driving circuit, simplifying the structure of the driving circuit, and simultaneously improving the utilization rate of the backlight lamp panel 20.
Wherein, after the capacitor C1 enters the charging state temporarily when the row driving signal Vs comes and the last row driving signal Vs is output, before the next row driving signal Vs is input, and after the first gate switch MI is switched from the conducting state to the open state, the capacitor C1 discharges the light, so that the first led L1 does not immediately extinguish, and continues to light for a period of time until the next row driving signal Vs is output, so that the second light emitting diode L2 starts to light, and also when the second gate switch M2 is switched from the conducting state to the open state, the third light-emitting diode L3 can not be immediately turned off until the third light-emitting diode L3 starts to be turned on, the time-sharing control of the three-color lamp is circularly realized, since the time-sharing control is to give a driving signal to each lamp individually, the magnitude of the voltage value of the driving signal can be adjusted to adjust the brightness of each lamp; meanwhile, one of the lamps can be controlled to independently emit light through time-sharing control, for example, only the red lamp is lighted when a red picture is needed, and the lighting effect of the backlight lamp panel 20 is further enriched.
Further, in a second preferred embodiment of the present invention, referring to fig. 4, the driving module 100 includes a third switching tube T3, a control end of the third switching tube T3 is connected to one end of the capacitor C1 and a second connection end of the first switching tube T1, the first connection end of the third switching tube T3 is electrically connected, the light emitting module 210 of the third switching tube T3 correspondingly includes a fourth gating switching tube M4, a fifth gating switching tube M5, a sixth gating switching tube M6, a fourth light emitting diode L4, a fifth light emitting diode L5 and a sixth light emitting diode L6, a first connection end of the fourth gating switching tube M4 is connected to the second connection end of the third switching tube T3, and a second connection end of the fourth gating switching tube M4 is connected to an anode of the fourth light emitting diode L4; a first connection end of the fifth gating switching tube M5 is connected to a second connection end of the third switching tube T3, and a second connection end of the fifth gating switching tube M5 is connected to the anode of the fifth light emitting diode L5; a first connection end of the sixth gating switching tube M6 is connected to a second connection end of the third switching tube T3, and a second connection end of the sixth gating switching tube M6 is connected to the anode of the sixth light emitting diode L6; the anode of the fourth light emitting diode L4, the anode of the fifth light emitting diode L5 and the anode of the sixth light emitting diode L6 are all grounded.
In this embodiment, the fourth light emitting diode L4, the fifth light emitting diode L5, and the sixth light emitting diode L6 can be controlled in a time-sharing manner, the first switch tube T1 is turned on when receiving a high level signal, then a first driving signal is output to the third switch tube T3 through the first switch tube T1 to provide an operating voltage for the third switch tube T3 to be turned on, at the same time, the fourth gate switch tube M4 is turned on, the fourth light emitting diode L4 is connected to a circuit, the fourth light emitting diode L4 is turned on to the ground to start lighting, and the fourth gate switch is turned on after the fourth light emitting diode L4 starts lighting; then the fifth gate switch tube M5 is turned on, and at the same time, the second driving signal is output to the third switch tube T3 through the first switch tube T1, the third switch tube T3 is turned on, the fifth light emitting diode L5 starts to light up, and then the fifth gate switch tube M5 is turned on; then, the sixth gating switch tube M6 is turned on, and at the same time, a third driving signal is output to the third switch tube T3 through the first switch tube T1, and the third switch tube T3 is turned on, so that the sixth light emitting diode L6 starts to light up, and the sixth gating switch tube M6 is turned on, thereby realizing time-sharing driving of three-color lamps, and three LED lamps can be simultaneously driven through one LED backlight driving circuit 10, avoiding matching each LED lamp with a separate driving circuit, simplifying the structure of the driving circuit, and simultaneously improving the utilization rate of the backlight lamp panel 20; and can give each lamp a drive signal alone, adjust the luminance of each lamp through the size of adjusting the voltage value of drive signal, also can only control one of them lamp and give out light alone, for example only brighten the red light when needing red picture, and then richen the light efficiency of backlight lamp plate 20.
The present invention also provides a corresponding LED backlight driving circuit, which is not described herein again because the LED backlight driving circuit is described above in detail.
Further, the present invention also provides a method for driving an LED backlight, referring to fig. 5, which includes the following steps:
s100, receiving a row driving signal and a column driving signal by a switch module, and outputting the row driving signal to a driving module after the row driving signal and the column driving signal are conducted according to the column driving signal;
and S200, controlling the light-emitting module to be lightened by the driving module according to the row driving signal.
Further, the row driving signal comprises a first driving signal, a second driving signal and a third driving signal, and the first driving signal, the second driving signal and the third driving signal are input in a time-sharing mode.
Specifically, referring to fig. 6, the step S200 includes:
s210, a first gating switch tube is turned on, and the driving module controls a first light emitting diode to light up according to the first driving signal;
s220, turning on a second gating switch tube, and controlling a second light emitting diode to be turned on by the driving module according to the second driving signal;
and S230, the third gating switch tube is turned on, and the driving module controls the third light-emitting diode to be turned on according to the third driving signal.
The invention also provides an LED backlight driving circuit, which is not described in detail herein because the LED backlight driving circuit is described in detail above.
In summary, the LED backlight driving circuit, the driving apparatus and the driving method provided by the present invention are characterized in that the LED backlight driving circuit is connected to a backlight panel, and includes a driving module and a switch module, the switch module is connected to the driving module, and the driving module is further connected to a light emitting module on the backlight panel; the switch module is used for receiving row driving signals and column driving signals and outputting the row driving signals to the driving module after the row driving signals are conducted, the driving module controls the light-emitting module to be lightened according to the row driving signals, and the utilization rate of an LED backlight area in the backlight lamp panel can be effectively improved by optimizing the structure of the driving circuit.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (10)
1. An LED backlight driving circuit is connected with a backlight lamp panel and is characterized by comprising a driving module and a switch module, wherein the switch module is connected with the driving module, and the driving module is also connected with a light emitting module on the backlight lamp panel; the switch module is used for receiving row driving signals and column driving signals, outputting the row driving signals to the driving module after the row driving signals are conducted according to the column driving signals, and controlling the light-emitting module to be lightened by the driving module according to the row driving signals.
2. The LED backlight driving circuit according to claim 1, further comprising an energy storage module, wherein the energy storage module is connected to the switch module and the driving module; the energy storage module is used for storing electric energy after the switch module is switched on, and further maintaining the lighting state of the light emitting module.
3. The LED backlight driving circuit of claim 2, wherein the switch module comprises a first switch tube, a control end of the first switch tube is connected to a column driving signal input end, a first connection end of the first switch tube is connected to a row driving signal input end, and a second connection end of the first switch tube is connected to the energy storage module and the driving module.
4. The LED backlight driving circuit according to claim 3, wherein the energy storage module comprises a capacitor, one end of the capacitor is connected to the second connection end of the first switching tube and the driving module, and the other end of the capacitor is grounded.
5. The LED backlight driving circuit of claim 4, wherein the driving module comprises a second switch tube, a control terminal of the second switch tube is connected to one terminal of the capacitor and the second connection terminal of the first switch tube, a first connection terminal of the second switch tube is connected to the light emitting module, and a second connection terminal of the second switch tube is grounded.
6. The LED backlight driving circuit of claim 4, wherein the driving module comprises a third switching tube, a control terminal of the third switching tube is connected to one terminal of the capacitor and the second connection terminal of the first switching tube, the first connection terminal of the third switching tube is connected to power, and the light emitting module of the third switching tube is connected to power.
7. An LED backlight driving device, comprising a PCB board, wherein a plurality of LED backlight driving circuits as claimed in any one of claims 1 to 6 are arranged on the PCB board.
8. An LED backlight driving method is characterized by comprising the following steps:
the switching module receives a row driving signal and a column driving signal, and outputs the row driving signal to the driving module after the row driving signal and the column driving signal are conducted according to the column driving signal;
and controlling the light-emitting module to light up by the driving module according to the row driving signal.
9. The method according to claim 8, wherein the row driving signal comprises a first driving signal, a second driving signal and a third driving signal, and the first driving signal, the second driving signal and the third driving signal are input in a time-sharing manner.
10. The LED backlight driving method according to claim 9, wherein the step of the driving module controlling the lighting of the light emitting module according to the row driving signal comprises:
the first gating switch tube is turned on, and the driving module controls the first light-emitting diode to light up according to the first driving signal;
the second gating switch tube is turned on, and the driving module controls the second light-emitting diode to light according to the second driving signal;
and the third gating switch tube is turned on, and the driving module controls the third light-emitting diode to light according to the third driving signal.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114023255A (en) * | 2021-11-22 | 2022-02-08 | 惠州视维新技术有限公司 | Drive circuit, drive device, and display device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114023255A (en) * | 2021-11-22 | 2022-02-08 | 惠州视维新技术有限公司 | Drive circuit, drive device, and display device |
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Application publication date: 20210413 |